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| EOAuth2ServiceBaseEOAuth2ServiceBase — An abstract base class for EOAuth2Service implementations | 
    GObject
    ╰── EExtension
        ╰── EOAuth2ServiceBase
            ├── EOAuth2ServiceGoogle
            ├── EOAuth2ServiceOutlook
            ╰── EOAuth2ServiceYahoo
An abstract base class, which can be used by any EOAuth2Service implementation. It registers itself to EOAuth2Services at the end of its constructed method. The descendant implements the EOAuth2ServiceInterface.